Seems like "history" is just a descriptive log. I just removed the entry from History but that didn't seem to make any difference and funds are still locked.
Like I've said above (
Post #50), the lightning funds below must be a "
bug" and there's no on-chain funds deducted.
And upon tinkering with the wallet file (
testnet), I've found out that you can manually remove those bugged channels by removing the "
channel backup" entry in the wallet file.
But that's quite dangerous if you don't know what you're doing so, restoring the seed should be enough if there no active channels in your wallet.